Synonyms for unseat

Most common

1. Oust — to remove (someone) from an office or position, especially a political one; to dethrone

2. Supplant — to cause (something) to be removed or replaced in its role; to displace, to overturn

Other

deseat rare

v. 1
To remove (someone) from an office or position, especially a political one; to dethrone.
India has recently unseated China as the world’s most populous country.
v. 2
To cause (something) to be removed or replaced in its role; to displace, to overturn.
Printed newspapers are gradually being unseated by digital publications.

Past participle: unseated
e.g. unseated → ousted, deposed, overthrown, supplanted…

overthrow They conspire to overthrow the oppressive government.
oust They wanted to oust the communist government of Fidel Castro.
depose Often the people do not wish to depose a tyrant, often they cannot not.
supersede Malians need to supersede their ethnic fault lines.
supplant Will artificial intelligence supplant human intelligence?

Use in printed books, per decade from 1850 to 2019.

The small number after each word is its number of syllables (depose² = 2 syllables).